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There are various types of eyepieces of varying quality to choose from. B. Magnification through the telescope has its limits. These limits are determined by the laws of optics and the nature of the human eye. The maximum usable power is equal to 60 times the aperture of the telescope (in inches). So your telescope has a maximum useful power of 180x (3" x 60). If you purchased the 114mm model (4.5") then your maximum useful power is 270x (4.5" x 60). You can create power higher than this limit but the images will be dark and blurred with poor contrast. The maximum power is used only under ideal conditions which are not common. Most of your viewing will be done in die range of 25x to 120x. Higher powers are used mainly for lunar and planetary observing under ideal seeing conditions. C. Your telescope (if you have the equatorial mount model) also has supplied as standard equipment a 2x Barlow Lens -1The Barlow Lens doubles the power of any 1V*" eyepiece that you use. 1. To use the Barlow Lens, insert the smaller barrel end into the focuser and tighten the thumb screw. Then insert a 1 /*' eyepiece in the other end of the Barlow Lens and tighten the thumb screw. If you have one of the altazimuth models, you can purchase a Barlow Lens as an optional accessory. 11 6. TELESCOPE OPERATION — ASTRONOMICAL OBSERVING After you have read and followed the instruction manual to this point, the telescope is set up and you are ready to begin your observing adventure. To enable you to find objects you should have a set of Star Charts or a Planisphere. The location of the planets may appear in local newspapers. A. The Moon is an awesome first object to observe. The best observing occurs during the partial phases as a full Moon is too bright. At low power you can see the complete Moon and at high powers you can see lunar details such as mountain ranges, craters and rills. B. Five of the planets are easy targets for your telescope. See Jupiter with its great red spot, study the cloud bands and watch its moons shuttle back and forth. Study Saturn and its splendid ring structure. Observe Mars and see its polar cap. Watch Venus and Mercury as they go through their moon-like phases. C. The Sun is quite safe to view if you utilize a proper solar filter. You can detect and watch the ever-changing sunspot activity. Remember to cover the finderscope when using a solar filter. D. Deep-Sky objects (those outside our solar system) offer a lifetime of observing. There are hundreds of objects within the realm of your telescope including open and closed star clusters, planetary and diffuse nebulae, galaxies, double stars and occasional comets. The amount of detail you can see is dependent on your observing site (dark sky rural locations are best), atmospheric conditions, brightness of the object, collimation and your observing experience. 7. TELESCOPE MAINTENANCE With proper care your telescope should rarely need any maintenance work. A. When not in use, always replace all lens covers to keep dust and contaminants off the optical surfaces. B. A small amount of dust on any optical surface is ok. If the dust builds up then use a can of compressed air and then a camel's hair brush to remove the dust. C. If the mirrors need cleaning, they should be cleaned by a professional. Either have your instrument serviced by a telescope repair facility or return it to the factory. D. Collimation or alignment of the optical system is done at the factory before shipment. 1. If your telescope has received very rough handling during transport or is dropped, it may need collimation. 12 To check if your telescope is in collimation the sketch below will help you. If you look into the eyepiece adapter (without an eyepiece) at the top of the focuser, this is what you should see. If the reflection of your eye is off center, then collimation is necessary. 2. If your telescope is out of collimation, the best way to re-collimate it is with a good collimation tool. Celestron offers a Newtonian Collimation Tool (#94183) with detailed instructions that make it an easy chore. SPECIFICATIONS Optical System: Aperture: Focal Length: F/ratio: Focuser Standard Oculars (or Eyepieces) #31030 \ #31030-WQS \ #31031 Newtonian Reflector 76mm (3") 700mm f/9.2 1%" Rack and Pinion 1 V*" size—the focuser also has an adapter to allow usage of .96” size oculars. #31046 Newtonian Reflector 114mm (4.5") 1000mm F/8.8 1 Vi" Rack and Pinion 1 Vi" size — the focuser also has an adapter to allow usage of .96” size oculars. NOTE: Specifications are subject to change without notice. 9. OPTIONAL ACCESSORIES Celestron International offers a wide assortment of optional accessories to expand your interests. A. Sky Maps (#93722) - Invaluable when learning the night sky. They include all the constellations with the brighter deep-sky objects. On the front cover is a rotating planisphere which indicates when specific constellations are visible. B. Flashl...
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Оптические приборы - 31030 (864.81 kb)